Abrading machine



Nov. M, 1939. A. s. JOHNSON ABRADING MACHINE Filed Feb. 15, 1957 2 Sheets-Sheet l AWEN TERI MW). 4 W

A s. JOHNSON 2.179.507

ABRADING MACHINE Filed Feb. 13, 1957 2 Sheets-Sheet 2 Patented Nov. 14, 1939 NlTED STATES PATENT GFFBCE ABRADIVG MACHINE Jersey Application February 13, 1937, Serial No. 125,608

19 Claims.

This application relates to abrading machines and is herein illustrated and described as embodied in a machine suitable for roughing surfaces of channels formed on shoe soles. In United States Letters Patent No. 2,004,109, granted June 11, 1935 on the application of John B. Hadaway and also in United States Letters Patent No. 2,037,238, granted July 20, 1937 on the application of Charles G. Brostrom there are disclosed machines for performing this same operation. The machine disclosed in the present application, like the earlier machines above mentioned, is provided with a roughing tool in the form of a pair of rotary roughing brushes adapted to operate upon the. channel lip and the base of the channel, respectively, and with a thin blade-like e extending between the brushes for guiding the shoe by engagement with the shoulder of the channel, and also with a treadle-operated member for holding the channel lip against the roughing tool.

It is an object of the present invention to provide an improved machine of the type under consideration.

In accordance with a feature of the invention, the gage extending between the two roughing brushes is so mounted as to yield under pressure when the operator desires to press the shoe with greater than ordinary force against the roughing tool. In accordance with a further feature, yieldable means are provided for limiting the pressure which can be exerted through the treadle mechanism upon the member which holds the lip against the abrading tool. As illustrated herein, this lip-supporting member is also arranged to yield toward the roughing tool to enable the operator to apply the shoe with additional pressure against the tool. The lip-holding member of the illustrated machine is wedge-shaped to enable it to enter the space between the turnedover lip and the outer surface of the sole. The operator is thus enabled to exert pressure upon this member through the sole. In accordance with a still further feature the roughing tool comprises a pair of rotary brushes one of which has relatively stiff bristles for operating upon the channel base and the other of which has more flexible bristles for operating upon the lip.

These and other features of the invention including certain details of construction and combinations of parts will be described in connection with the illustrated machine and pointed out in the appended claims.

Referring now to the accompanying drawings,

Fig. 1 is a view in front elevation of the upper portion of the improved machine;

Fig. 2 is a view in end elevation of the parts shown in Fig. 1;

Fig. 3 is an enlarged showing of the roughing tool illustrated in Fig. 1;

Fig. 4 is an enlarged sectional view taken on the line IV-IV of Fig. 1; and

Fig. 5 is a detail view showing an element of a roughing tool in process of assembly.

The tool which performs. the roughing operation comprises a roughing brush I!) having bristles which are relatively flexible for operating upon the inner surface of an opened channel lip and a roughing brush l2 having stiifer bristles for operating upon the base of the channel. In the illustrated construction the bristles of both brushes are of steel wire, the diiierence in flexibility being obtained by making the bristles of the brush IE] of a finer wire than those of the brush E2. The stiffer bristles of the brush i2 enable a relatively harsh abrading action to be performed upon the channel base to obtain the desired degree of roughness, while the more flexible bristles of the brush ill operate yieldingly upon the thin material of the lip without danger of tearing or scouring through the lip. Re-

ferring to Fig. 3, this tool is seen in operation upon a shoe S having a channel lip L and a channel base B. The bristles of the brush ID are mounted in a ring Hi while the bristles oi the brush ii are mounted in a ring it. The rings it and it are both clamped upon a hub it by a nut l9 threaded upon the outer end portion of the hub. The brush It is provided with a pair of flanges 29 and 22 between which the bristles are confined and beyond which the bristles extend radially. The brush l2 has a similar pair of flanges 24 and 26, respectively. Between the adjacent flanges 22 and 24 of the brushes l0 and i2, respectively, is a spacing ring 28. The abovementioned flanges and the spacing ring 28 are all assembled in proper relation to the rings It and it upon the hub l3 and clamped thereon by the nut 19. The hub is is provided with a flange 3% against which the assembly of brush members is clamped. It will be noted that in the illustrated machine the brush III which operates upon the channel lip is frusto-conical in form, while the brush l2 which operates upon the channel base is cylindrical.

The hub it with the brush member secured thereon is mounted upon the reduced end portion 32 of a shaft 34, being retained thereon against axial movement by the head of a screw 3B which is threaded into the reduced end of the shaft. The hub I8 is retained against rotary movement relatively to the shaft 36 by a lug 38 extending from the reduced end of the shaft into a slot formed in the hub Id.

The supporting structure of the machine will now be described. The shaft 36 is journaled in bearings M3 and d2 formed in a head M which is secured upon the upper portion of a column d6 of a suitable standard adapted to rest upon the floor. The shaft 3% at its opposite end carries a pulley 58 by which the shaft is driven from any suitable source of power. The head M has an upwardly and rearwardly extending portion 58 in which is rigidly and fixedly secured a horizontal rod 52 which at its outer end carries a bracket 5d. The bracket 5 is suitably bored to enable it to fit over the reduced end of the rod 52 and is clamped thereupon by a pin 5t having a cylindrical concave portion for engaging the rod 52 and having a threaded end for a nut 58 by which the pin 56 may be tightened.

Loosely fitting within the space between the adjacent flanges 22 and 2d of the brushes is a thin blade-like gage or guide 66 of arcuate form partially surrounding the shaft 3%. The gage 60 is pivotally mounted upon a pin 62 (Fig. 2) which is secured in a depending portion 64 of the bracket 54. Also mounted for rotation upon the pin s2 is a bracket Gil having a forked upper portion which embraces a pin $8 threaded into the bracket 54. Surrounding the outer portion of the pin as and interposed between an enlarged head on the end of the pin 68 and the bracket es is a coil compression spring lil tending to urge the bracket 86 in a clockwise direction, as viewed in Fig. 2. Threaded through the bracket 66 is an adjustable stop screw 12 which is held in any desired position of adjustment by a lock nut i i. The end of the screw 72 engages a surface formed on the bracket 5d and thus determines the position of adjustment in which the bracket 65 is held by the spring l6.

Formed in the gage cc is an arcuate slot l6 concentric with the pin 62 and adapted for engagement with an unthreaded portion of the shank of a clamping screw 78 which is threaded into the bracket 55 and which normally secures the gage 69 in fixed relation to the bracket. However, the gage it} may readily be swung into an out-of-the-way position, as shown in broken lines in Fig. 2, by loosening the screw T8. The gage Ell when secured for operation to the bracket 65 is held down by the spring '56 in a position adjustably determined by the stop screw l2. As will later be pointed out, the spring it may yield to enable the operator to force the gage 69 upwardly whenever he regards a deeper or harsher abrading action desirable.

It will be noted with reference to Fig. 2 that the gage i5!) has extending from its outer or workengaging edge a salient portion at. The operator normally holds the work against this salient portion, particularly when it is necessary to turn the shoe upon a short radius such as occurs at the toe portion, inasmuch as the shoe can more readily be pivoted around the relatively short salient portion 88. The outer edge of the gage might, in the absence of such a salient portion, tend to impede such turning movement.

For holding the lip L against the brush ii] there is provided a wedge-shaped member 82 having a shank M- which extends through an opening formed in a bracket 86 and which is adjustably secured in the bracket 8!; by a pair of nuts 38 and fill both threaded upon the shank 8d. The bracket 86 is likewise provided with a threaded shank 92 which extends through an opening in the end of a lever 9d and is held in any desired position of adjustment with respect to said lever by a pair of nuts 96 and 93 threaded upon the shank e2. The lever 9:1 is fulcrumed upon a pin Hill which may be secured in any desired position of heightwise adjustment in a vertical slot I02 formed in a vertical web Hi3 extending from the bracket 54. The lever at has an upwardly extending arm it into which loosely extends a pin H35 which depends from a pair of ears ltd between which is pivotally mounted by means of a pin i It carried by the ears Hi8 onev end of an operating rod H2. t will be noted that when it is desired to swing the lever 9 to an out-ofthe-way position for a purpose which will later be i entioned, the rod H2, together with the ears IE8 and the pin Hi6, may readily be lifted to free the arm Hi4. Upon the opposite end of the rod I I2 are threaded a pair of nuts I M and IE5, each provided with a locking nut H8 and i253, respectively. The portion of the rod H2 between the nuts IM and i it extends through an opening formed in an arm I 22 of a bell crank which is fulcrumed upon a pin I25 secured in a bracket E26 carried by the rod 52. Surrounding the rod H2 and interposed between the nut H 3 and the arm S22 is a coil compression spring I28. A similar spring I30 also surrounding the rod Ill is interposed between the nut HE and the arm I22. Suitable washers i532 are employed upon opposite sides of the arm M2 to receive the thrust of the springs. The above-mentioned bell crank is provided with a horizontally extending arm I34 to which is pivotally connected the upper end of a treadle rod I36. The lower end of the rod I36 is connected to a treadle of usual construction which is normally held up by a spring I38. A stop screw I35 adjustably threaded through the upper portion of the bracket I2 5 and held by a lock nut I3'I engages the arm I34 and thus limits the upward movement of the treadle rod I35 and determines the normal (i. e. non-operating) position of the lip-holding member 82. Downward movement of the treadle rod I36 is limited by a split collar I39 which is adjustably clamped on the rod I36 by a screw Ml, the collar I39 being engageable with an extension I 33 of the bracket I26 through which the rod I36 passes.

Referring to Figs. 3 and 4, it will be observed that the lip-holding member 82, which has been described as wedge-shaped, is received into the space between the turned-over lip L and the outer surface of the sole of the shoe S. The upper surface of the wedge is identified by the reference character M5. The edge of this surface ME! which is first engaged by the advancing work is relieved, as indicated by the reference character M2, to facilitate feed of the work. The lower surface of the wedge which is identified by the reference character E le is convexly rounded to facilitate feed of the work and manipulation of the shoe.

A guard M5 for protecting the shoe upper particularly in the vicinity of the shank is provided. This guard, as best shown in Fig. l, is coneshaped, having its large end open and closely adjacent to the bristles of the brush l2, and it extends over a sector sufficient to include the locality of operation of the brushes upon the shoe. The guard I46 depends from a bracket III? to which the guard I46 may be secured in any desired position of horizontal adjustment. To this end the guard I46 is provided with a lug I59 having a horizontal slot formed therein through which extends a clamping screw I52 which is threaded into the bracket I48. The bracket I48 likewise is secured in any desired position of vertical adjustment in a bracket I56, the bracket I48 having a vertical slot I tit through which extends a clamping bolt I58 threaded into the bracket EM. The'bracket I54 is mounted for horizontal adjustment in a direction perpendicular to the axis of the shaft 34 and to that end is slidably secured on a shelf Itil which extends horizontally from the bracket 56. The bracket IE4 is secured in its desired position of adjustment by a screw I62 extending through a slot in the bracket I56 and threaded to the shelf I60. From the foregoing it will be evident that the location of the guard I46 can be adjusted in all three dimensions.

In order to dispose of dust arising from the roughing operation there is provided a dust hood IE4 (the lower portion of which is shown as broken away, being indicated by broken lines) which surrounds the upper portion of the roughing tool and which is carried by a bracket ISIS secured upon the rod The hood I64 has an outer wall It? which is hinged at I69 for upward swinging movement, the hinged wall being normally held down by a spring. The hood I6 1 leads into an exhaust conduit I68 of the usual suction system.

In order to keep the surface of the work free of dust which otherwise might accumulate thereupon there is provided a blast nozzle Il'il directed in opposition to the rotation of the roughing tool. The nozzle I10 is located at the lower end of a pipe III which is supplied by a conduit I72 from a blower m having an inlet III; and driven by a chain I73 from a sprocket wheel I80 011 the shaft 36. The head M is formed to provide a housing I82 for the chain and sprocket, a detachable cover I84 being provided upon the opposite side. The blower I'M is secured upon a bracket I86 which is mounted for vertical adjustment on the head M and is secured thereon by clamping screws 588. The conduit I'I2 and the pipe III are held by a support I 90 carried by a bracket I92 secured by a screw I93 to the bracket 56.

The arrangement for securing the bristles upon the rings I 5 and I6 is shown in Fig. 5. This arrangement is the same for both rings, and while for purposes of illustration the reference character I I has been applied to the ring of Fig. 5, everything shown in that figure is equally true in connection with the ring It. Referring to Fig. 5, it will be noted that a bundle of bristles 5% has been looped to form two tufts. Extending radially through the ring I I are a plurality of holes I 96, the outer end portions I98 of which are counterbored to a larger diameter. A loop of a wire 208 is threaded outwardly through each of the holes I96, passed over the bight of the loop of bristles IBM, and pulled tight to seat the bristles securely within the counterbore I98. When all of the counterbo-red holes have been filled with bristles in this manner the adjacent ends of the wire 206 are twisted together to secure the bristles permanently. An annular groove 202 is formed in the inner surface of the ring It to accommodate the wire 208. An advantage of mounting the brushes I0 and I2 upon separate rings I4 and I6, respectively, resides in the fact that either brush when worn may be replaced without loss of the other brush. After the brushes III and I2 have thus been assembled upon the hub I3 they may be ground to the desired shape and diameter.

The operation of the machine will now be described. The operator, holding the shoe with the heel end away from him, inserts the end portion of the lip L between the member 82 and the brush I II and bears downwardly upon the treadle, causing the member 32 to press the lip against the brush. He then feeds the shoe away from him, holding the shoe pressed upwardly and toward the right with the shoulder of the lip against the gage til. The downward movement of the treadle is limited by the stop MI and the pressure of the member 82 when the treadle is in its lowermost position is governed by the adjustment of the spring I28. If the channel flap has become warped and stiff by excessive drying the spring I28 will yield wherever necessary to prevent scouring through the flap. When the condition of the leather is such as to require greater than normal pressure against the brushes to obtain the same roughing effect or when a deeper der surface Md of the member 32 causes the member 82 to press the lip with greater force against the brush Iil, for even although the collar I39 is against the stop MI the yielding of the spring I 38 will permit such further upward movement of the member 32. the yielding of the gage 6U enables the brush I2 to act with greater pressure upon the base of the channel. The guard Mt protects the upper of the shoe from damage, particularly at the shank portion.

It will be observed that the flap-holding member 82 may be angularly adjusted about its own axis by turning the shank 8d in the bracket 86 and it may also be angularly adjusted about the axis of the shank 92 by turning the shank $2 in the lever 9 5. Both adjustments are performed independently of the mechanism for swinging the lever 9&- about the pin IdIl to control the distance of the flap-holding member from the roughing brushes. The flap-holding member 82 moreover, may be adjusted for position in the direction of its own axis by making one or more complete turns of the threaded shank M in the bracket 86, and it may be adjusted in the direction of the axis of the threaded shank 92 by making one or more complete turns of the latter in I the lever 94. In addition, a heightwise adjustment for the flap-holding member 32 is provided in the pin IIIII and the slot Hi2. It is possible by reason of these adjustments to vary in all three dimensions the position which the flapholding member will tend to assume under the influence of the treadle mechanism, and it is possible also to set the flap-holding member at any desired angle independently of its positional adjustment.

When regrinding of the brush is necessary the hub I8 is removed by taking out the screw 36. To facilitate removal of the brush, the pin I lit is withdrawn from the lever arm IM which enables the member 82 to be swung upwardly out of the way. The hinged wall I6? of the dust hood is also swung upwardly out of the way.

Having thus described my invention, what 1 At the same time guiding work presented to said roughing tools,

and a support constructed and arranged normally to maintain said gauge in a predetermined position relatively to said roughing tools and to yield under pressure of the Work to enable the operator when he so desires to hold the work against said roughing tools with greater pressure than that permitted by the gage in its normal position.

2. An abrading machine comprising a frame, a driven shaft journaled in said frame, a pair of abrading tools mounted on said shaft and separated from each other axially by a relatively narrow space, a gage extending into the space between said tools for guiding work presented to said tools, said gage being mounted for movement toward and from the axis of said shaft, a stop for limiting the movement of the gage away from said axis, and resilient means for holding said gage yieldably against said stop, whereby the operator is enabled when he so desires to hold the work against said tools with greater pressure than that permitted by the gage in its stop position.

3. A machine for abrading channel flaps on shoe soles comprising an abrading tool constructed and arranged to operate upon one surface of a channel flap, a member engageable with the opposite surface of the flap to hold the fiap against said abrading tool, means for urging said member toward said abrading tool to cause said member to press the flap against said abrading tool, and yieldable means for limiting the pressure which said urging means causes said flap-holding means to exert against the flap.

4. A channel roughing machine comprising a driven abrading tool constructed and arranged to operate upon the channel flap and the channel base of a channeled sole, a member engageable with the outer surface of the channel flap to hold the inner surface of the flap against said abrading tool, a treadle mechanism for urging said holding member toward said abrading tool to cause said member to hold the flap against the abrading tool, a stop for limiting the movement of said treadle mechanism in a direction to urge said holding member toward the abrading tool, and a spring associated with said treadle mechanism between said step and said holding memher to enable said holding member to yield.

5. A machine for abrading channel flaps on shoe soles comprising an abrading tool constructed and arranged to operate upon one surface of a channel flap, a member engageable with the opposite surface of the flap to hold the flap against said abrading tool, and means for urging said member toward said abrading tool, said urging' means including a connection constructed and arranged to enable said holding member to be moved toward said abrading tool independently of said urging means.

6. A machine for abrading channel flaps on shoe soles comprising an abrading tool constructed and arranged to operate upon one surface of a channel flap, a member engageable with the opposite surface of the flap to hold the flap against said abrading tool, means for urging said member toward said abrading tool, and a yieldable connection including a pair of opposed springs arranged in said urging means to enable said holding member to yield both toward and from said abrading tool independently of said urging means.

7. A machine for roughing channel flaps on shoe soles comprising a roughing tool constructed and arranged to operate on one surface of a channel flap, a wedge-shaped member constructed and arranged to enter the space between a turned over channel flap and the outer surface of the sole from which the flap has been formed, means for urging said member toward said abrading tool to cause said member to hold the flap against the roughing tool, and a resilient connection in said urging means constructed and arranged to enable said wedge-shaped member to yield away from said roughing tool under excessive pressure and to yield toward said roughing tool when the operator exerts pressure through the shoe against a face of said wedge-shaped member.

8. A machine for roughing surfaces of channels on shoe soles comprising a rotary wire brush, a gage engageable with a channeled sole to position a surface of the. channel in desired relation to said brush to control the normal pressure-of the work against the brush, and a yieldable support for said gauge constructed and arranged to enable the operator to press the work against said brush with greater than normal pressure.

A machine for roughing surfaces of chanels on shoe soles comprising a rotary wire brush, a gage engageable with a channeled sole to position a surface of the channel in desired relation to said brush to control the normal pressure of the work against the brush, a spring for supporting said gage against the pressure of the work, and an adjustable stop against which said spring normally holds said gage, said spring yielding to enable the operator to press the work against said brush with greater than normal pressure.

1.0. A machine for roughing channel flaps on shoe soles comprisirr a roughing tool constructed and arranged to operate on the exposed surface of a turned over channel flap, a member engageable with the sole on which the flap is formed and also with the unexposed surface of the flap for supporting the flap against said roughing tool, a gage engageable with the sole to position the exposed surface of the channel flap in desired normal relation to said roughing tool, and supports for said gage and for said flap-supporting member constructed and arranged to yield under pressure of the sole as the operator resse's the work toward the roughing tool with greater than normal pressure.

11. A machine for roughing surfaces of channels on shoe soles comprising a rotary driven roughing tool and a thin blade-li e gage having an edge adapted for engagement with the shoulder of a channel to position the work relatively to said roughing tool, said work-engaging edge having a salient portion extending outwardly from said tool to facilitate turning of the work.

12. A machine for roughing surfaces of channels on shoe soles comprising a roughing tool constructed and arranged to operate on the exposed surface of a turned over channel flap, a member engageable with the unexposed surface of the flap to hold the flap against said roughing tool, and a support for said flap-holding member constructed and arranged for angular adjustment of said flap-holding member about two axes which are angularly disposed to each other.

13. A machine for roughing surfaces of channels on shoe soles comprising a roughing tool constructed and arranged to operate on the exposed surface of a turned over channel flap, a member engageable with the exposed surface of the flap to hold the flap against said roughing tool, and a support for said flap-holding member constructed and arranged for angular adjustment about two axes and also for locational adjustment of said flap-holding member in all three dimensions.

14. A machine for roughing surfaces of channels on shoe soles comprising a roughing tool constructed and arranged to operate on the exposed surface of a turned over channel flap, a wedge-shaped member for holding the channel flap against said roughing tool, said Wedgeshaped member being constructed and arranged to enter the space between the turned over channel flap and the outer surface of the sole from Which the flap has been formed, and yieldable means for maintaining said wedge-shaped member in an operative position relatively to said roughing tool, said position-maintaining means being constructed and arranged to enable the operator to exert pressure through the shoe and through the wedge-shaped member to press the channel flap against the roughing tool.

15. A support for holding a channel lip against a roughing tool comprising a generally wedgeshaped member adapted to be received between a turned over channel lip and the sole from which said lip extends and having an upper face for supporting the lip, which upper face has one of its edges relieved to facilitate feeding of the lip, and having also an under face for engagement with the sole, said under face being convexly rounded in the direction of feed.

16. A machine for roughing surfaces of channels on shoe soles comprising a roughing brush having relatively stiff bristles for operation upon the base of a channel, a roughing brush having relatively flexible bristles for operation upon the flap of the channel, and means for guiding a sole in relation to said brushes.

17. A tool for roughing surfaces of channels on shoe soles comprising a pair of rotary brushes mounted in side-by-side relationupon a single one of said brushes having relatively stiff bristles for roughing the base of a channel and the other brush having relatively flexible bristles for roughing the flap of the channel.

18. A tool for roughing surfaces of channels on shoe soles comprising a hub, a pair of rings slidably mounted on said hub for ready replacement and carrying elements for roughing the base of a channel and the flap of the channel respectively, said hub having a flange engageable with one of said rings, and means engageable with the other ring for exerting an axial clamping pressure through said rings against said flange to hold said rings securely upon said hub.

19. A tool for roughing surfaces of channels on shoe soles comprising a hub, a pair of brush rings slidably mounted on said hub for ready replacement and carrying wire bristles for roughing the base of a channel and the flap of the channel respectively, a spacing ring between said brush rings, said hub having a flange engageable with one of said rings, and a nut threaded on said hub for exerting an axial clamping pressure through all of said rings against said flange to hold said brush rings securely on said hub.

ARTHUR S. JOHNSON. 

